一种基于GY／T220．1-2006标准的OFDM信道估计算法

在卫星移动多媒体广播系统中,由于多普勒频移及多径影响,信道是时变的,需要估计出信道的时域或频域响应来消除时变信道对传输信号的影响。针对GY/T 220.1-2006标准的导频插入图案,提出了一种基于LS估计准则、在时间轴方向二维线性内插、频域轴方向变换域内插的信道估计算法。仿真结果表明,在不同多径信道的情况下,随着信噪比的增加,该算法的性能均优于最近插值、线性插值和低通滤波插值算法。该算法计算复杂度较spline插值和cubic插值低,适于硬件实现。

Channel Estimation Algorithm for OFDM Systems Based on GY/T 220.1-2006

Channel estimation is needed in order to eliminate the negative influence of time-varying multipath channels with Doppler frequency shift in the satellite mobile multimedia broadcasting system.This paper proposes a LS-based pilot-aided channel estimation algorithm followed by the linear interpolation in the time axis and the FFT-based interpolation in the frequency axis.The simulation is based on GY/T 220.1-2006 criterion.The simulation results show that the FFT-based interpolation method has an increased performance,which is better than the most nearest interpolation,linear interpolation and LPF-based interpolation and has lower computation complexity than spline interpolation and cubic interpolation,following the increasing of the S/N in different channel environments.